can't save edits

As of about an hour ago I suddenly had trouble editing my pages. When I went into the HTML editor, made changes, and hit update, the html window stayed open. After closing it, I tried to save the changes to the page, but oddly enough, after hitting the button, I got a warning that navigating away from the page would cause me to lose changes. Which is what happened. This keeps happening, so I cannot edit my pages at all. Help!